<!DOCTYPE HTML>
<html>
    <head>
        <meta charset="utf-8">
        <title>message test</title>
    </head>
    <body>
        <button id="openIframe">打开IFrame</button>
        <script src="../../../define.js?pro=./"></script>
        <script type="text/javascript" src="./a.js"></script>
    </body>
</html>